Damp-proof condenser



Oct. 13, 1931. w, RUDIGER 1,827,112

DAMPPROOF CONDENSER Filed Nov. 21, 1928 a WI Imrsn ur- Q Helm Rii di er flm Patented Oct. 13, 1931 UNITED STATES PATENT OFFICE WALTER RIIDIGER, OF BERLIN-KARLSHORST, GERMANY, ASSIGNOR TO TELEPHON- APPARAT FABRIK E. ZWEITUSCH AND COMPANY, OF BERLIN, GERMANY mmr-rzaoor CONDENSER Application filed November 21, 1928, Serial No. 320,828, and in Germany larch 22, 1928.

The present invention relates in general to moisture proof containers for electrical apparatus such as condensers, and the principal object of the invention, briefly stated, is

a the production of a new and improved mofsture proof container suitable for use under extreme conditions such as are encountered I in the tropics. It is known that the insulation resistance is greatly reduced when mere traces of (lampness enter the condenser. The condenser coils which are sealed with paraffin and fitted into casings which are then filled up with a material of the asphalt typein the usual manner,

; are no. the best for use in the tropics, because they do not comply with the more stringent requirements as regard damp-proofness. Also that type of filling is often destroyed by insects. In order to obtain an; effective 30 closure, it is therefore necessary to use a metal covering lid for condensers to beused in the tropics this lid being placed on the casing and then soldered to it. There is difiiculty in insulating the leadin -in wires from the covering lid, owing to t e stricter requirements as regards damp-proofne'ss. It has been proved that even accurately fitting insulating bushes do not meet the requirements.

The, present invention enables the conductors to be taken through the metal casing without there being the least danger of dampness penetrating into the condenser through the part where the leads pass through. There is the further advantage that this method of passing through the leads can conveniently be adopted on a manufacturing scale, so that the met 0d according to theinvention is considerably cheaper than that hitherto used for takingthe leads through. These advantages 40 are obtained by embedding the leading-in wires in insulating material of any knownkind which can be pressed into any desired shape. Material having this adaptability as regards shape is best for the present purpose. because it fits tight into all uneven parts of the leading through points to be closed up,

and after pressing hasbeen done, it forms a rying out the invention. Fig. 1 shows a condenser casing seen in front elevation: Fig. 2 shows it in plan; Fig. 3 shows a side elevation partially in section.

The soldering tags 1 and 2 forming the metal connections pass through the cap 3 of the casing and are insulated therefrom. As

can be seen from Fig. 3, the metal cap 3 of the condenser has a folded edge 6 at the leading through point, so that the insulating material 4, which is pressed into the cap. can shrink tight onto the ca A zigzag shape is given to the part of the soldering tags 1 and 2 where they are embedded in the insulating material in order to increase the creep path for the damp and also to give the soldering tags a firm hold in the insulating material. The cap 3 is inserted in the casing 5 and secured to it by soldering them together.

What is claimed is A container for electrical equipment havingv a cover comprising a cup-shaped metal body havlng 1ts sides secured to said container and having a centrally located aperture the rial entirely encasing said bent edges to form' a long creep path' for moisture.

In witness whereof, I hereunto subscribe my name this 23rd day of October. A. D. 1928.- WALTER RUDIGER.

rigid binding between the condenser casing and the soldering tags.

50 In Figs. 1 to 3 is shown a method of car- 

